Yesterday, someone firebombed the local campaign office of the North Carolina GOP in Orange County, leaving behind graffiti reading "Nazi Republicans get out of town or else" and a swastika spray-painted on an adjacent building. While Donald Trump was quick to blame "animals representing Hillary Clinton and Dems in North Carolina" for the episode, a loose online network of liberals and progressives led by my friend David Weinberger, a research fellow at the Berkman Center, threw together a GoFundMe page to help pay for reopening the office.In a brief call to action, he wrote, "Until an investigation is undertaken, we cannot know who did this or why. No matter the result, this is not how Americans resolve their differences. We talk,...